This has me a little perplexed to say the least. I bought this 2007 Compass Limited 4X4 back in early March. It has the CV2 autostick feature and came with just under 25K miles on it. Up until the last 3-4 weeks I was averaging between 24.3 - 24.7 mpg with every tank of gas.
I have not changed my driving habits, or route to work. The tire pressure is right where it has been at 35psi when cold with no uneven wear to the tread noted. I have changed the oil (going to amsoil full synthetic), changed the air filter and the spark plugs to the Iridium plugs referenced in THIS
thread and verified the gap was correct on all the plugs. This was all done prior to the drop being noted. Yet, instead of those things either helping to maintain or improve my mileage, for some reason it's slipped down to roughly 21.3mpg the last few tanks now.
I have even thought it may be the gas, so each fill up I've tried to hit a different gas station, but no luck in getting it back up where it was. I'm not getting any warning lights indicating any issues with the engine and when I am at a complete stop at a red light, it's still idling so smoothly that I can hardly hear or feel it.
Does anyone have any idea as to what may have so suddenly caused that drop? With the price of gas being what it is and the amount of driving I do (In the 4 months I've owned it I've put over 6K miles on it) every little bit adds up quick in the wallet. Any ideas, suggestions or comments are appreciated.
And yes, if I can't come up with anything I'll try to find a day when I can get it to a dealer to check it out to see if they come up with anything. Thanks.